Enterprise Software for Managing Mission Critical Applications

Legacy Modernization, DevOps, Cloud Migrations, COBOL 6.2 Conversion, Workload Management are all challenges for Mainframe Management and Technicians. At Marble, we have you covered. View Demo


Simplify Migration from IBM's COBOL V 4.2 to COBOL 6.2

Control/DCD – Aids in COBOL 6.2 Migration Projects from COBOL V 4.2 by providing detailed analysis of older COBOL programs for compliance with the new Enterprise COBOL Compilers including flagging items such as Invalid Data.


Legacy Modernization & Application Migrations

Re-engineer Mainframe Applications quickly and economically with: Control/DCDRES View Video


Document the IT Enterprise

Control/DCD - Digital Documentation Manual
Docet/EV - Automate Enterprise Wide Documentation


Programmer Techniques Used in Control/DCD


Perplexing Challenges

Application Modernization is a fact of life for most IT organizations. The use of new computing platforms like the Cloud as well as new mobile computing devices has created challenges far beyond ever imagined a few years ago. However, these Legacy Applications contain the mission critical data processes of past generations.The goal to success is to unearth these secrets and accurately upgrade these Legacy Applications or move them to new platforms as required. At Marble Computer, we have the software products to make this task easier.


Marble Computer has a long history of supporting Enterprise Computing clients that date back to 1977. 

 Marble Computer delivers Best of Breed software tools for IBM Mainframe customers to ensure the Integrity, Performance and Analysis of their COBOL Applications.

 Our flagship product, Control/DCD, documents COBOL programs with our Digital Document Manual (DDM) technology.  Docet/EV Documents the IT Enterprise.  Ripple-Trac helps convert Legacy Data to RDBMs platforms.

Marble Computer’s software tools focus on Dev/Ops, Legacy Modernization and Cloud Migration projects. 

Latest Tools


RES is an advanced set of software products for documenting the IT Enterprise. Docet/EV is a must have tool for Legacy Modernization, DevOps and Cloud Migration implementations.


Control/DCD is the latest version of the DCD Data Correlation and Document product. Control/DCD significantly reduces the cost of maintaining COBOL applications and produces the Digital Documentation Manual (DDM).

DCD Pre-Compiler for COBOL 6.2

Control/DCD has the necessary functionality to provide warnings and capture errors in older versions of IBM compilers.  There are many types of errors that the Control/DCD Pre-Compiler will catch thus making migrations to Enterprise COBOL compilers faster and less costly.

Featured Articles and White

Future of Cobol

Managing COBOL Code for Mainframe Applications has become a difficult task. The shortage of experienced mainframe programmers has left organizations with little choice but to offshore the maintenance of the application code with less experienced programmers or try to develop in-house COBOL programming talent.

White Paper – The Future of COBOL and COBOL Programmers

Marble Welcomes our Newest Control/DCD Clients

  • Dillard’s Department Store
  • Anthem Healthcare
  • Blue Cross Blue Shield of South Carolina
  • Healthcare Services
  • Caterpillar
  • Social Security Administrations
  • State of California
  • State of Illinois
  • John Deere

Control/DCD for Conversion to COBOL V 6.2

Control/DCD is a useful software tool for the conversion of COBOL applications to the new IBM COBOL compiler known as
Version 6.1. For many large organizations the continued use of the Mainframe platform is justified as a back end data server. This is true for 2 reasons, Total Cost of Ownership (TCO) and security. So we find Mainframes still processing large batch jobs utilizing COBOL code that goes back 40-50 years. The “Tribal Knowledge” is long gone.

To read the full brochure or to download click here.

Control/DCD Brochure

Managing Source Code on Mainframe Applications has become a difficult task. The shortage of experienced COBOL mainframe programmers has left organization’s with a dilemma regarding the maintenance of the application code. Most of today’s COBOL programmers have little knowledge of the Legacy Application’s logic or the business rules.

IBM Reseller Announcement

Marble Computer is pleased to announce that we are now an IBM Partner reselling z/OS software products. Our focus initially will be in the application development tools Rational and Problem Determination Tools.

Why Marble’s Control/DCD is Useful for Moving Away from V 4.2

The observation made on our part is that companies are looking at what is needed for conversion to COBOL 5 or 6 and moving very slowly to do the conversion.
There may be several reasons for moving slowly and only one of these reasons may be the time to convert the COBOL, yet the time to do the conversion is still a significant consideration.
Download the full Article Here.

“Those of you who are familiar with legacy systems know the widely cited stat: *70-80% of all business transactions worldwide are written in COBOL. That represents 220-350 Billion lines of COBOL Code. And there are roughly 1.5 Billion lines of new code created each year. *Gartner/IBM”

“Is COBOL the dinosaur language that will eventually go away? Think twice, Fortune 500 IT Executives must figure out who will maintain their mainframes when COBOL programmers retire in the future. The cost to convert is too expensive.”

“The Mainframe is not going away. Organizations worldwide run between 220-350 billion lines of code today. It would be a herculean feat to replace every single program with a new language without introducing detrimental bugs. Oh, and the cost would be in the Trillions of Dollars. *Gartner/IBM”

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